Dipper tooth



` Dec. 2, 1930. R WATTS 1,783,350

DIFFER TOOTH Filed Deo. 17, 1928 lL- 1 l Q l Patented Dec. 2, 1930 JAMES RALPH WATTS, 01E' CASTLE, DELAWARE, ASSIGNOR TO AMERICAN MAN- GANJESE STEEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F MAINE DIFFER TOOTH Application' filed December 17, 3.928. Serial No. 326,466.

rlhis invention relates to improvements in clipper teeth and particularly to improvements in two-part dipper teeth and in the securing means between the parts.

As shown by Patent'No. 943,77 5 to Exton and Sherrerd, December l, 1909, it has Abeen common practice to form dipper teeth connected to the forward edge of the dipper front in two parts because lor the fact thatl the end of the tooth receives the greater amount of the wear and, therefore, is made removable so that the entire tooth need not be scrapped, thereby saving the cost ot the high-grade manganese steel required for the parts of the tooth. The two parts of the tooth consist ot' a base or shank secured to the lip of the dipper :front and a removable tip or point secured to the bas/e. Further in order to allow` a longer period ot use without renewal, both the base and tip are made reversible so that if the lower face of either the base 0r tip is worn either part may be reversed to present a new face in position to receive the wear. As shown by the patent mentioned above, the tip' is provided with divergent rearwardly extending jaws which abut against a V-shaped point formed on the nose of the base member and the tip is provided with a rearwardly extending shank which enters into a receiving Iopening in the base member. rlhe heavy stresses exerted laterally and transversely onv the points of the teeth are prevented/from shearing the shank of the point or tip by the tl-shaped point of the base contacting with the divergent jaws. Furthermore, the web which connects the tip to the shank prevents the spreading of the jaws. In the construction shown by the patent, the Securin means between the shank andthe base mem er consists of a taperedl bolt or pin passed transversely to the axis of the members and holding the tip by a wedging action.

lit is the purpose of this invention to improve upon the securing means shown in the patent named above by providing a standard bolt and nut for connecting the tip to the base member which extends substantially along A the axis of the members and is concealed within the interior of the members.

llt is further the object of this invention to formed in the sub-base member and secured by a standard bolt and nut connection. The shank of the tip is provided with lateral openings in order to releasably connect with the head and shank of the bolt. The subbase member -is also provided with a` lateral opening into which will extend the threaded end of the bolt to receive a nut inserted through the lateral opening. The construcy tion of the sub-base member is such that the longitudinal socket and the lateral opening open up the section of the castingto permit uniform heat treatment.

Other and further objects of this'invention will be easily' apparent as the improvements are more fully described.

lln the drawings in which a preferred embodiment is Yspecifically shownlFigure l shows a side elevation of the dipper tooth.

l `igure2 is a vertical sectional view on line 2 2 of Figure 1.

Figure 3 is a front elevation of the clipper. tooth shown in Figure l, having the pointed tip removed.

Figures 4c and 5 are detail views of the pointed tip taken at right angles to each other.

rl'he drawings show one form of construction of a dipper tooth corresponding to dipper teeth which have been used inthis art except for the design ofthe shank of the pointed tip and the nose of the base member and the securing means betweenl the two parts. rlhus there is shown a shank or base member 'l having upper and lower attaching Jaws 2 and 3, leaving an opening 4 therebetween to receive the front lip and having a connect-mg web 5 between the two jawslo which prevents spreading and fits intoa slot in the lip. The jaws are piovided with openings' and 7 allowing the entrance of bolts to connect the base to the lip of the dipper front in the usual manner. The hase ineinber 1 is shown reversible thus after the lower face is worn i-t may be reversed to present' the opposite face, since it is of symmetrical construction.

The nose 8 of the base member 1 is tapered and at its end is formed into a V-shaped point 9. A pointed tip 10, usually formed from liigh-grade manganese steel, is adapted to be secured to the nose 8. The tapered point is clearly shown in Figures 4 and 5 in which it will be apparent that there are rearwardly extending divergent jaws 11 and 12 connected by a vertical web 13 which eX- tends rearwardly and is formed into a substantially rectangular shank 14. With the point assembled to the base, as shown in Figure 1, it is apparent that the point 10 is secured tightly against the nose 8 and the V-shaped point 9 of the nose 8 extends between the divergent jaws 11 and 12 thus preventing the shearing of the secured shank 14 due to vertical stresses. The shank 14 of the pointed tip extends within an opening 15 formed in the end of the nose 8. The o-pening 15 is substantially rectangular to conform to the shape of the shank 14, and, at its end, connects with a circulai' opening 1G which is adapted to receive the end of a. bolt 17. As shown in Figure 4, the shank 14 is provided with a transverse opening 18 permitting entrance of the head of the bolt 17. The body of the bolt'17 lies in an open slot or depression 19 extending from the opening 18 in the shank 14 to the end thereof. In order to permit the connection of a nut 21 to the screwed end of the bolt which passes through the opening 16, there is provided a transverse opening 2O in the side` of the base member 1 which is widened or made large enough to permit the use of an operating tool to tighten the nut 21.

The parts are assembled by resting the bolt 17 in the seat 19 provided on the shank 14 of the point 10 and passing the shank of the point together with the bolt 17 longitudinally through the opening 15 of the base member 1, the end of the bolt 17 entering opening 16, meanwhile holding the nut 21 in position to be attached to the bolt 17 by means extending through opening 20. Thus it will be apparent that the bolt and nut may be tightened to firmly secure the point 10 to the base member 1. The securing means consisting of the bolt 17 and nut 21 are not subjected to wear since they are concealed within the interior of the nose 8 and, it is .further apparent that the securing means cannot be accidentally disengaged in use. The provision of securing means extending generally along the longitudinal axis of the parts secured as shown, permits use of a standard bolt and nut instead of a special tapered boltor pin as previously used. Furthermore, the pins previously used are liable to become deformed Since they hold the shank of the tip by a wedging action and are subjected to shear.

1 claim:

1. In excavating apparatus, a 'digging tooth comprising a tooth base having inclined upper and lower faces and vertical side walls, said side walls forwardly extending beyond said upper and lower faces to form tapered noses, said base having aA rectangular socket opening inwardly from between the side walls, said base also having a transverse pocket opening into said base from one side wall and a bolt receiving opening connecting said socket and said pocket, a tooth point designed to be mounted on said tooth base and including a shank to be received iirsaid socket, diverging jaws rearwardly extending from said point having inclined upper and lower faces to cooperate with the upper and lower faces of said base, said shank having a substantially T-shaped slot opening transversely into the side of said shank, a bolt connecting said shank to said base and adapted to fit into said T-shaped slot and a securing nut for said bolt adapted to be inserted through the lateral pocket of said base and to be threaded to the end of said bolt.

2. n excavating apparatus, a dipper tooth comprising a detachable and reversible subbase member and a detachable and reversible tip member said tip and said siib-base including inclined upper and lower surfaces cooperating to form a substantially wedge shaped point, the connect-ion between said tip and sub-base comprising a shank,rearwardly extending from said tip rectangular in section and having its greatest depth in a ver tical direction said shank having a. loiigitudinal slot inwardly cut from a vertical side wall and communicating with a transverse opening in said shank having a vertical dimension slightly greater than the width of said slot, said sub-base member including openings which open up the metal of the base nieniber for heat treatment and include a longitudinal socket to receive the shank of said tip and a lateral opening rearwardly spaced from the inner end of said socket and a bolt receiving opening connecting said socket and said lateral opening, astandard bolt and nut connection for securing said tip to said sub-base member, said bolt fitting into the openings formed in said shank and having a threaded end of said bolt extending into a lateral opening of said sub-base ineinber in order to receive a threaded nut.

Signed at New Castle, Delaware, this 10th day of December, 1928.

JAMES RALPH VATTS. 

